Moistureproofing device



Aug. 13, 1946. v

M. A. SHRIRO MOISTUREPROOFING DEVICE Fil ed Jan. 20, 1944 FIG].

FIG.2.

INVENTOR.

M.A. SHRIRO fink/ ka.

-' A f rner Patented Aug. 13 1946 UNITED st rs ,MoIsTUREPRooF'ING imvron Morris A. Shriro, Elberon, N. J., assignor to the United States of America, asrepresented by the Secretary of War Application January 20, 1944, Serial-No. 519,013

' lClaim. (01.220535); 1

(Granted'under the act of March 3, 1883, as

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

My invention relates to means for moistur proofing closed compartments and more particularly to the use of a collapsible member to prevent the ingress and egress of air to a sealed compartment.

The necessity for moisture proofing scientific apparatus is well known. One solution to this problem lies in placing apparatus in sealed compartments. A survey of the state of the art reveals that it is difficult to hermetically seal a compartment so as to eliminate completely all minute openings. It has been found that when the air in a sealed compartment becomes heated, the air expands and passes out through the minute openings resulting from improper sealing. Then, when the internal air cools, a partial vacuum is formed within the compartment and external air containing moisture will enter the compartment through the minute openings. This moisture condenses within the closed compartment and results in oxidation of any apparatus contained therein.

It is an object of my invention to furnish a means for eifectively sealing compartments.

It is a further object of my invention to provide a collapsible apparatus, which apparatus shall act in conjunction with a compartment to effectively seal the compartment.

It is a further object of my invention to provide an apparatus which shall compensate for the expansion or contraction of the air within a sealed compartment so that no air will pass in or out through any small openings that may remain subsequent to the sealing of the compartment.

I have solved the problem of effectively sealing closed compartments by introducing into the compartment an airtightcollapsible member, which member is open at one end. This open end is positioned over an aperture in a Wall of the compartment, and the junction is sealed airtight. Suitable means are provided for mounting the collapsible member, for sealing the junction, and for protecting the collapsible member against injury.

My invention thus discloses an inexpensive and effective apparatus by means of which a closed compartment may be completely insulated against the passage of air through any minute openings that may remain after the compartment has been sealed. The advantage of the invention will be amended April 30, 1928; 370 O, G. 757) readily seen in connection with the necessity for ':'sealing radio sets and components in moisture proof containers.

By the use of my invention, the air in the compartment, when it becomes heated andexpands, will spend itself in collapsing the collapsible member, rather than in forcing its way through any minute openings that may exist. Thus there will be a movement of air within the compartment,

but there will .be no passage of air from themsideof the compartment to the outside thereof.

Heretofore this expansion of air has resulted in the passageof air through minute openings in the compartment to the outside thereof. Thus when the compartment cooled, a partial vacuum has formed within the compartment, and external air containing moisture has entered the compartment. The presence of this moisture results in rapid deterioration of the apparatus within the compartment.

For a better understanding of my invention, together with other and further objects, reference is had to the following description, taken in connection with the accompanying drawing:

Figure 1 is a perspective view of my invention, in which the compartment is partially cut away to show the elements of my invention.

Figure 2 is a cross-sectional view of my invention taken through line 2, 2 of Figure 1.

Referring to the figures in which like numbers refer to like elements, I represents a hermetically sealed compartment that has been provided with an aperture. An airtight collapsible member 4, which is closed at one end, opens externally to the compartment through the aperture.

Guard 6, the lower ends of which are drilled to receive bolts, is placed around collapsible member 4 for protection and support. Annular frame 2, in which is positioned grill 3, is placed on the outer surface of compartment I around and over the aperture. Annular washer 5 is placed between collapsible member 4 and guard 6.

In the embodiment shown, the arms of the guard 6 are radially 45 apart. Thus, the frame 2, collapsible member 4, annular washer 5, and the area immediately surrounding the aperture in compartment I are provided with holes 45 apart to provide for the introduction of bolts or other connecting means.

In assembly, annular frame 2, carryin grill 3, is placed over the circular aperture in compartment I. A series of bolts are then inserted through the annular frame 2 and the wall of the compartment l to extend into the compartment.

3 Collapsible member 4 is then introduced onto the bolts. Annular washer 5 is th'en introduced, the purpose of which is to hold element 4 tightly against element I so that there will be no passage of air at this junction. Guard B-i then introresults in an increase of theoubioemeasurement' of the compartment when the air becomes 'heated and collapses the collapsible member, resulting :in at constant air pressure. :Since theeir pressure :remainsconstant-"there is no (passage of air through minute openings to the exterior 'ofthe compartment. 1

"1 When :the air in the compartment 1' contracts uponbo'oling', the external air will enter through theraperturerin the compartment and expand the zisack 4rrathe'r than enter through:any smallop'en- :lingrin the compartment. Thus the'movement of ah: duet-to alternate expansion and contraction .wi11--,;operate-' solely upon the airtight collapsible fzmember 4 and there wilr be no' passage of air fromrand-intothe sealed compartment I 30 the wall.

4 Although I have shown and described certain specific embodiments of my invention, I am fully aware that many modifications are possible. My invention, therefore, is not to be restricted ex- 5 t cept insofar as is necessitatedby the prior art F'and by the spirit of the;appendedac laim.

I claim: I A pressure equalizing device comprising an en- 'closed compartment, an aperture through a wall of-said compartment, a substantially fiat annu- .1ar framedisposed-about said aperture and out- -sidesamwan. aperforated grill sustained by said frame :extending across said aperture, the frame and grill being substantially flush with the .15 exterior of :saidwall, a, flexible sack, an opening in saidsack, said sack being disposed, within said compartment and said opening in said sack being intregisterowitlr said aperture and the mouth bis-said opening-abutting the inner surface of said 2 wall, an annular washer encircling said sack, the

, tending through and securing the -framefthe sack, the washer tandthe guard to the wall of the compartment-and pressing the mouth of the .sack-between the walland the washer to form a tight seal between the mouth of the sack and i. Mortmsn. sumac.- 

